Designed specifically for the RAS-12 semi automatic shotgun, these 00 buckshot polymer cased shells are designed to stack vertically in a standard .308 SR-25 style magazine with proprietary follower. The unique design has all of the functionality of the legacy 12 gauge shotshell, but with additional payload capabilities. Only capable of being fired in RAS-12 upper and shotguns, this unique caliber provides true 12 gauge functionality in DPMS style lower receivers.